1991 Ford Explorer - Answered Questions & Fixed issues
1991 Ford Explorer 4.0. It has high revs 2000-2500 and do not fall.
- Throttle control problems: A sticky throttle control or a malfunctioning throttle position sensor could be causing the high revs.
- Ignition system issues: A faulty ignition module or spark plugs could cause the engine to run rich, causing high revs.
- Vacuum leaks: A vacuum leak can cause the engine to run lean, leading to high revs. Check for any visible leaks in the vacuum lines and hoses.
- Fuel system problems: A clogged fuel filter, a failing fuel pump, or a malfunctioning fuel pressure regulator could cause high revs.
- EGR valve: A clogged or sticking EGR valve could cause the engine to rev high.
It's recommended to have a professional mechanic diagnose the issue using an OBD-II scanner to retrieve the error codes and perform a proper diagnosis. Based on the error codes and the symptoms, they can determine the root cause of the problem and recommend the necessary repairs.
2/2/2023 1:40:32 AM •
1991 Ford...
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Answered
on Feb 02, 2023
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54 views
Engine flutters loudly at stop lights. Sounds normal when driving.
You should not drive a car if the check engine light comes on and you do not know what the problem is. In some cases the check engine light means a serious problem and I know could cost a lot of money to repair. Mine came on and cost $800 dollars to repair as I tried to drive it.
12/29/2017 9:12:01 PM •
1991 Ford...
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Answered
on Dec 29, 2017
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182 views
Is there a killswitch in a 1991 explorer
I had a 91 and don't remember a kill switch of any kind in it. What was the scenario when the vehicle died? May be able to guide you in the right direction.
8/6/2017 3:07:03 AM •
1991 Ford...
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Answered
on Aug 06, 2017
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111 views
94 ford ranger 2.3 stnd
talk with an auto electrician as there are now many alternators that are controlled by the ECM ( voltage regulator is in the ECM) 14.5 volts -14.38 volts is good voltage control so the problem may not be the regulator at all
problem could be a shorting diode in the circuit or other problems not connected to either the alternator or regulator such as wiring shorting out , bad connections etc
may even be an ECM problem
5/7/2017 12:05:56 AM •
1991 Ford...
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Answered
on May 07, 2017
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483 views
91 ford explorer turns over , tries to start
The catalytic converter or muffler maybe plugged up. This is based on the engine getting fuel and fire to the plugs. I would remove the 02 sensor ahead of the cat. and see if truck will start, be aware if it does start it will run rough. When the cat or muffler get blocked off it puts back pressure on the engine and thus not allow fuel into the cyl. to fire.
5/6/2017 4:14:56 PM •
1991 Ford...
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Answered
on May 06, 2017
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73 views
My 1991 ford explorerc xlt idles up and down
Check for vacume leaks and fix all that you find and if still does it check for codes...Could be several things causing this Mass Air sensor , Idle air control ......Most likely vac leaks or mass air .....Make sure air filter is clean
11/30/2016 1:07:51 AM •
1991 Ford...
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Answered
on Nov 30, 2016
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257 views
How do I repair ignition switch?
Well call and price it between a garage and locksmith. If they are the same price. Use the locksmith, because he comes to you. You will have to get the truck to the garage, Tow bill..
12/27/2015 3:45:29 PM •
1991 Ford...
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Answered
on Dec 27, 2015
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137 views
Is the engine aluminum
On a 1990 Ford Explorer the engine block is cast iron, and the cylinder heads are aluminum .
12/6/2015 8:48:51 PM •
1991 Ford...
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Answered
on Dec 06, 2015
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131 views
How do I pull the heater core on a 1991 Ford Explorer XL?
Actually, it is pretty easy to do. remove the glove box assembly. the case cover is right there. remove the 2 heater hoses under the hood. remove the inside cover screws and the core unbolts and comes right out. It only pays 1.2 hours in a shop. And you don't have to mess with the A/C system.
11/13/2015 10:05:05 PM •
1991 Ford...
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Answered
on Nov 13, 2015
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205 views
How do I get the horn to work and rear defrost? Is it a fuse related problem?
The horn and rear defrost are on two different circuits. There will be a fuse for each. Most common problem on SUV,s for the rear defrost is a broken wire on the glass grid of the rear window. As for the horn,it could be caused by a bad horn/fuse/horn relay/horn pad/broken wiring. You need to disconnect the wire to the horn and use a test light to see if there is power at the horn when the horn button is pressed. If there is power, the horn is bad. If no power, any of the afore mentioned could be the problem
10/10/2015 3:07:04 PM •
1991 Ford...
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Answered
on Oct 10, 2015
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233 views
TRANSMISSION
sounds like the tranny pump is going bad or bad band in drive trane
6/15/2015 9:05:55 PM •
1991 Ford...
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Answered
on Jun 15, 2015
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240 views
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